Rename all subtitles to match movie

sort.py

from collections import namedtuple
import os
import re

FileInfo = namedtuple('FileInfo', ['toname', 'subname'])

def doit():
    directory = os.fsencode('.')

    matcher = re.compile('.*[sS](\d+)[eE]([0-9\-]+).*')
    realsuffix = '.mkv'
    renamesuffix = '.srt'

    tab = dict()

    for fil in os.listdir(directory):
        filename = os.fsdecode(fil)
        #print (filename)
        match = matcher.match(filename)
        if not match:
            continue
        num = (match.group(1), match.group(2))
        if num not in tab:
            tab[num] = FileInfo(None, None)
        if filename.endswith(realsuffix):
            realbase = filename[:-len(realsuffix)]
            #print (num, realbase)
            if tab[num].toname:
                raise NameError('{0} already has toname {1}'.format(num, tab[num].toname))
            else:
                tab[num] = FileInfo(realbase + renamesuffix, tab[num].subname)
        elif filename.endswith(renamesuffix):
            #print (num, filename)
            if tab[num].subname:
                raise NameError('{0} already has subname {1}'.format(num, filename))
            else:
                tab[num] = FileInfo(tab[num].toname, filename)
        else:
            print ('Ignoring: {0}'.format(filename))

    tonames = set()
    for num, info in tab.items():
        if not info.toname:
            raise NameError('{0} is missing toname'.format(num))
        if not info.subname:
            raise NameError('{0} is missing subname'.format(num))
        if info.toname in tonames:
            raise NameError('{0} duplicate toname'.format(toname))
        tonames.add(info.toname)

    for num, info in tab.items():
        print ('rename "{0}" to "{1}"'.format(info.subname, info.toname))
        os.rename(os.fsencode(info.subname), os.fsencode(info.toname))

if __name__ == '__main__':
    doit()